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(No Model.) 2 Sheets-Sheet 1. A. DELANEY & J. M. BOND.

SAW MILL DOG.

No. 344,355. Patented June 29, 1886.

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2 Sheets-Sheet 2.

(No Model.)

A. DELANEY 8v J. M. BOND.

SAW MILL DOG.

No. 344,355. Patented June 29, 1886.

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UNITED STATES PATENT OFricE.

ALEXANDER DELANEY AND JOHN M. BOND, OF RICHMOND, VIRGINIA.

SAW-MILL DOG.

SPECIFICATION forming part of Letters Patent No. 344,355, dated June 29,1886.

Application filed January 8, 1886. Serial No. 187,959. (No model.)

To all whom it may concern:

Beitknown that we, ALEXANDER DELANEY and JOHN M. BOND, citizens of theUnited States, residing at Richmond, in the county of Henrico and Stateof Virginia, have invented certain new and useful Improvements in Log-Dogs for Saw-Mills, of which the following is a specification.

This invention relates to mills.

In the accompanying drawings, which illustrate the invention, Figure 1is a side elevation of certain parts of a saw-mill and the improved dog,showing the position of the latter when not in use. Fig. 2 is a frontelevation of the same. Fig. 3 is a top view of the same. Fig. 4 is aside elevation of the improved dog and those parts of a saw-mill whichaid in its proper illustration. In this view the dog is shown holding alog. Fig. 5 is a view of the dog-driver and dog.

The letter A designates a head-block resting on the timbers B of asaw-mill carriage, and E the knee, which, as usual, slides on theheadblock.

The dog-tooth c is fixed on the end of an This arm may be integral withthe a dog for sawarm, a rest of the dog-driver proper or it may beseparate, and by occupying a socket havinga set-screw, a it may therebybe adjustable.

The dog-driver, including the dog, is shown separately in Fig. 5, andconsists of a circular or partly-circular head, C having a portion ofits rim provided with gear-teeth d and another portion, c, smooth orwithout teeth. Rigidly attached to this head 0" is an arm, 0, which hasthe socket and set-screw a above referred to but, as also stated, thesocket may be dispensed with, and this arm 0 and the dog-arm a may beintegral. Another arm, 0, is attached to the circular head, and has ahandle, 0 and serves as a lever for raising or drawing back the head andthe dog-tooth arm. The head 0 is a metal casting, and has in itscomposition sufficient metal to give it the requisite weight to impartdriving-force to the dog-tooth arm. It may be made weighty to anydesired extent by casting a bulk, b, of metal at one side. (See Fig. 3.)

At one side of the knee E, or to any other suitable support, is attachedthe means whereby to support and raise and lower the dogdriver. Theseconsist of a vertical rack, F, comprising teeth 0, and on each side ofthe teeth a guide, f. In other words, the rack F has two guides, f,which form between them a vertical groove, (see Fig. 3,) and the teeth 6of the rack are in the groove. The toothed portion (1 of the rim of thehead 0 occupies the rackgroove, and the teeth d of the head engage orgear with the teeth 0 of the rack. It will thus be seen, by reference toFig. 1, that when the raised dog-arm moves down to strike the timber thehead 0 partly turns, and the teeth (I will traverse down the rack F andthe weight of the metal head 0 will impart the force to the dog-arm, bywhich it is driven with a curved movement forward and down and into thetimber.

By reference to Fig. 4 it will be seen that when it is desired to raisethe dog-arm from the timber H the lever-handle 0 must be drawn back anddown, which action will cause the teeth (I of the head 0 to traverse upthe rack F. By thus making the dogarm and a weight to drive it directlyand rigidiy united as one part, (see Fig. 5,) and arranging it asdescribed, a device of great effectiveness and extreme simplicity isproduced.

That partofmy invention relating to the dog arm Oprovidcd with aweighted driver, 0, directly united to it,is distinguishable from otherknown devices in that the arm and weighted driver here shown aredirectly and rigidly united and are not pivoted, and when the dog arm isdriven forward and down with a curved movement to strike the timbertheweighted driver and the end of the dog-arm attached to it movesvertically downward. The construction of this (logarm and weighteddriver are such also as to permit them at any time to be readilydetached by merely lifting them from their support.

A device of some kind is necessary to retain the dog-driver head O incontact with the rack F. In this instance we show a grooved guide, I,for this purpose. This guide has vertical position, and the smoothportion 0 of the rim of the dog-driver head occupies the groove 9 in theguide. As one portion of the head 0 is in the rack F and thediametricallyopposite portion in the guide I, it will be seen the saidhead cannot leave or be disengaged from the rack. A latch, G, is a barbent at an angle, and has at one end a hook, it, which engages with thelever handle or arm O and holds it down, thereby keeping the dog-arm inan elevated position, as in Fig. 1. This latch swings on a pivot, h,while the end h opposite the hook end serves as a weight to cause thehook to press in the right direction, and also as a handle whereby torelease the hook.

\Ve deem it useful and desirable to have a device which when the dog ais in the timber will keep it in. The action of the saw causes aconstant jar to the timber, whichtends to release the dog therefrom, andwe therefore pro vide means to prevent the dog from withdrawing itself.This consists of a fixed ratchet-bar, L, having a curved shape, and apawl, i, on the dog-arm to engage with the said ratchet. The pawl inthisinstance is at one side of the dogarm, and is attached to a pivotbolt,7a, which passes through the arm, and a short lever, i, is attached tothe pivot-bolt at the other side of the arm. A spring, Z, presses on theshort lever and keeps the pawl normally in position to engage with theratchet L.

A bell-crank lever, m, is pivoted on the lever handle or arm 0, and ared, it, connects the bell-crank lever with the pawl-lever i. Thisconstruction insures that, upon the dog a being driven into the timber,the pawl i will automatically engage with the ratchet L, and therebykeep the dog from being released. When about to withdraw the dog, thefirst thing is to press the bell-crank lever to the lever-handle G whichserves to lift the pawl from the ratchet. The dog-arm may then beraised.

The operation of the dog is as follows: The log is first rolled on thehead-block A and against the knee E. The dog-tooth arm a. is adjusted inits socket to bring the dog-tooth a to the position where it will strikeand enter the log at the desired point. The latch G is then disengagedfrom the lever-handle O, whereupon the dog-lever arm 0 is driven forwardand down, forcing the dog a into the log.

Having described our invention we claim,

and desire to secure by Letters Patent of the United States- 5o 1. Asaw-mill-dog mechanism comprising the combination of a dog, a dog-arm,and a weighted driver, 0 directly united to. the said dog-arm, andmeans, substantially as described, for guiding the weighted driververtieally when the free end of the dog-arm takes a curved movement, forthe purpose set forth.

2. A saw-mill-dog mechanism comprising a dog, a dog-arm, and a weighteddriver directly and rigidly united to the dog-arm, said driver having apartlycircular shape and provided with gear-teeth, in combination with astationary vertical rack with which the said gear-teeth engage, as setforth.

3. A saw-mill-dog mechanism comprising a dog, a dog-arm, and a weighteddriver directly and rigidly united to the dog-arm, said driver having apartly-circular shape and provided with gear-teeth, in combination witha stationary vertical rack with which the said gearteeth engage, and aguide to retain the driver in contact with the rack, as set forth.

4. A saw-mill-dog mechanism comprising a dog, a dogarm, and a weighteddriver united to the dog-arm, said drivel having a partlycircular shapeand provided on one portion with gear-teeth d, while another portion, 0,is smooth or without gearteeth, in combination with a rack with whichthe said gear-teeth engage, and aguide havinga groove, g, which is Stoccupied by the said smooth portion of the driver, as set forth..

5. A saw-niill-dog mechanism, having in combination a dog, a dog-armcarrying the said dog and having aweighted driver directly 8 5 andrigidly united thereto, a pawl pivoted on the said dogearm, a knee, andacurved ratchet-bar with which said pawl engages, arranged as shown anddescribed.

In testimony whereof we a'lfix our signatures 0 in presence of twowitnesses.

ALEXANDER DELANEY. JOHN M. BOND. Witnesses:

G. A. PEPLE, I. S. TOWER.

